AK4629 Datasheet, PDF (17/46 Pages) Asahi Kasei Microsystems – High Performance Multi-channel Audio CODEC

[AK4629]
■ De-emphasis Filter
The AK4629 includes the digital de-emphasis filter (tc=50/15µs) by IIR filter. De-emphasis filter is not available in
Double Speed Mode and Quad Speed Mode. This filter corresponds to three sampling frequencies (32kHz, 44.1kHz,
48kHz). De-emphasis of each DAC can be set individually by register data of DEMA1-D0 (DAC1: DEMA1-0, DAC2:
DEMB1-0, DAC3: DEMC1-0, DAC4: DEMD1-0 see “Register Definitions”).
Mode
0
1
2
3
Sampling Speed
Normal Speed
Normal Speed
Normal Speed
Normal Speed
DEM1
0
0
1
1
DEM0
0
1
0
1
DEM
44.1kHz
OFF
48kHz
32kHz
(default)
Table 7. De-emphasis control
■ Digital High Pass Filter
The ADC has a digital high pass filter for DC offset cancellation. The cut-off frequency of the HPF is 1.0Hz at fs=48kHz
and scales with sampling rate (fs).
MS1277-E-02
- 17 -
2012/03